Study on dielectric relaxation Spectra of Surfactant-free Microemulsion composed of Water / Ethanol / Triethyl Citrate

Abstract

In this paper, the dielectric relaxation behavior of surfactant-free microemulsion composed of pure water / ethanol / triethyl citrate (TEC) from 40Hz to 110MHz was studied. There is an obvious relaxation phenomenon between 103 and 105Hz in the selected experimental path, which is presumed to be interfacial polarization relaxation, indicating that there is a microscopic phase region in the system. The dielectric relaxation parameters fitted by a dispersion term Cole-Cole formula, that is, relaxation intensity Δε and relaxation time t, obviously vary with the phase composition of the system, and different trends can indicate that the system is in different microemulsion phase regions. It is proved that the dielectric spectrum technique can accurately characterize the surfactant-free microemulsion.